Truss-reinforce for concrete.



No. 859,311. r P'ATENTED JULY 9, 1907.

v 1). MAXWELL.

muss REINPORGE FOR CONCRETE.

APPLIOATION FILED APR. 6, 1906.

WITNESSES mVENToR III--III of Fig. 1.

DAVID MAXWELL, OF DETROIT, MICHIGAN.

'rn'uss-nnmronon son oononn'rn.

Specification of Letters Patent.

Fatented July 9, 1907.

Application f led April 6, 1906. Serial Nb. 310,269.

To all whom it may concern:

Be it known that I, Divro Miixwnnn, of Detroit, Wayne county, Michigan, have invented a new and useful Truss-Reinforce for Concrete, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation'of my improved reinforce; Fig. 2 is a cross-section of the blank from which it is formed; and Fig. 3 is a cross-section on the line My invention relates to metal reinforcing for concrete beams and structures, and is designed to provide a reinforce which may be cheaply and simply made,

and: which will give prompt resistance to the compressive tensile and shearing stresses. In the drawings, in which I show a preferred formof my invention, Fig. -2 represents in cross-section the preferred form of blank. This blank consists of the rolled section having a web 2, a square top chord 3 and a. diamond-shaped lower tension chord 4. This rolled section is slitted on oblique lines extending upwardly and outwardly from .the lower central portion, the inclination being opposite onopposite sides of the center. The slitted portions are then bent intooppositely directed flanges 5 and 6, thus giving a Z-shape to each brace, as shown in Figs. 1 and 3.

The central portion of the web is preferably cutout in triangular form as shown at 7. As the horizontal lines of cut are parallel with the top and bottom chords the bending outward of the flanges will cause their alternate upper and lower ends to extend at inclines, as shown at 8 andv 9. The slitting may be carried out by rolls or presses, and the bending may be formed by presses or any other desirable manner.

' The advantages of my invention result from the great strength of the concrete beam, in which this reinforce is embedded. The braces extend upwardly and ,outward in opposite directions on opposite sides of other changes may be made without departing from my invention.

I claim:-

1. A metallic reinforce for concrete structures in the form of a braced truss, said truss consisting '0f a lower chord, an upper chord, and oblique members or braces connecting the upper and lower chords and having flanges bent laterally in opposite directions; substantially as saidchords, said braces having oppositely bent laterally extending flanges; substantially as described.

4. A metallic reinforce formed from a plate having a lower thickened chord portion, the web of said plate being cut on opposite inclines and the braces thus formedsubstantially as flanges, the central portion of the web being open; sub

stantially as described.

7. Anaetallic -reinforce, consisting of a truss formed of an integral plate whose upper and lower edge portions constitute the upper and lower chords of the truss, the intermediate portion of the plate having therein a plurality of oblique slits, and the metal between the slits being shaped to form braces having oppositely directed laterally extending flanges; substantially as described.

-8. A metallic reinforce consisting of an integral plate formed with a plurality of oblique slits inclined in opposite directions at each side of the center of the reinforce, the slits at one side of the center being inclined reversely to those at theother side, and the metal between ;each adjacent pair of slits being shaped into flanged braces connected at top and bottom by the integral edge portions of the plate; substantially as described.

In testimony whereof, I have hereunto set my hand.'

. DAVID MAXWELL.

vWitnesses I CHARLES F. DELBBIDGE,- Anci nun D. S'm'NsnLL. 

